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src/main.rs
34
src/main.rs
@ -1,35 +1,38 @@
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// imports for concurrency, time, and web server
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use std::sync::{
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atomic::{AtomicU64, Ordering},
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Arc,
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};
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use std::time::{Duration, SystemTime, UNIX_EPOCH};
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{header, Body, Request, Response, Server, StatusCode};
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use serde::Serialize;
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use sysinfo::System;
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use tokio::sync::RwLock;
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use std::collections::VecDeque;
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use std::convert::Infallible;
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// represents a single data point with timestamp and value
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#[derive(Clone, Serialize)]
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struct TimeSeriesPoint {
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timestamp: u64,
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value: f64,
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}
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// collection of time series points
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#[derive(Serialize)]
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struct TimeSeriesData {
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points: Vec<TimeSeriesPoint>,
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}
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// manages time series data with age-based cleanup
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struct TimeSeries {
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points: VecDeque<TimeSeriesPoint>,
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max_age: Duration,
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}
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impl TimeSeries {
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// creates new time series with specified max age
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fn new(max_age: Duration) -> Self {
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Self {
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points: VecDeque::with_capacity(max_age.as_secs() as usize + 1),
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@ -37,23 +40,28 @@ impl TimeSeries {
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}
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}
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// adds new point and removes old ones
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fn add_point(&mut self, value: f64) {
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let now = SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.unwrap()
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.as_secs();
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let cutoff = now - self.max_age.as_secs();
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// remove expired points
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while self.points.front().map_or(false, |p| p.timestamp < cutoff) {
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self.points.pop_front();
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}
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self.points.push_back(TimeSeriesPoint { timestamp: now, value });
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}
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// returns all points as vector
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fn get_points(&self) -> Vec<TimeSeriesPoint> {
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self.points.iter().cloned().collect()
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}
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}
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// stores metrics for requests and cpu usage
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struct Metrics {
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requests_series: TimeSeries,
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cpu_series: TimeSeries,
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@ -61,10 +69,10 @@ struct Metrics {
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}
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impl Metrics {
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// initializes metrics tracking
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fn new() -> Self {
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let mut sys = System::new_all();
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sys.refresh_cpu_all();
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Self {
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requests_series: TimeSeries::new(Duration::from_secs(900)),
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cpu_series: TimeSeries::new(Duration::from_secs(900)),
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@ -72,25 +80,30 @@ impl Metrics {
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}
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}
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// adds requests per second data point
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fn add_requests_per_second(&mut self, rps: f64) {
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self.requests_series.add_point(rps);
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}
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// adds cpu usage data point
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fn add_cpu_usage(&mut self, cpu_usage: f64) {
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self.cpu_series.add_point(cpu_usage);
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}
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// updates and returns current cpu usage
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fn refresh_cpu(&mut self) -> f64 {
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self.sys.refresh_cpu_all();
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self.sys.global_cpu_usage() as f64
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}
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}
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// counts requests using multiple atomic counters
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struct RequestCounter {
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shards: Vec<AtomicU64>,
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}
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impl RequestCounter {
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// creates counter with specified number of shards
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fn new(num_shards: usize) -> Self {
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let shards = (0..num_shards)
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.map(|_| AtomicU64::new(0))
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@ -98,11 +111,13 @@ impl RequestCounter {
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Self { shards }
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}
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// increments random shard counter
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fn increment(&self) {
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let idx = fastrand::usize(..self.shards.len());
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self.shards[idx].fetch_add(1, Ordering::Relaxed);
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}
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// resets all counters and returns sum
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fn swap_and_sum(&self) -> u64 {
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self.shards
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.iter()
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@ -111,12 +126,14 @@ impl RequestCounter {
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}
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}
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// handles http requests
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async fn handle_request(
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req: Request<Body>,
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request_counter: Arc<RequestCounter>,
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) -> Result<Response<Body>, Infallible> {
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request_counter.increment();
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// route requests to appropriate handlers
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match req.uri().path() {
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"/stats" => {
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let html = include_str!("stats.html");
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@ -134,7 +151,6 @@ async fn handle_request(
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points: metrics_read.requests_series.get_points(),
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};
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let json = serde_json::to_string(&data).unwrap();
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let response = Response::builder()
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.status(StatusCode::OK)
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.header(header::CONTENT_TYPE, "application/json")
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@ -149,7 +165,6 @@ async fn handle_request(
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points: metrics_read.cpu_series.get_points(),
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};
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let json = serde_json::to_string(&data).unwrap();
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let response = Response::builder()
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.status(StatusCode::OK)
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.header(header::CONTENT_TYPE, "application/json")
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@ -168,30 +183,30 @@ async fn handle_request(
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}
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}
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// main entry point
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#[tokio::main]
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async fn main() {
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// initialize shared state
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let metrics = Arc::new(RwLock::new(Metrics::new()));
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let request_counter = Arc::new(RequestCounter::new(256));
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let metrics_clone = Arc::clone(&metrics);
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let request_counter_clone = Arc::clone(&request_counter);
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// spawn background metrics collection task
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tokio::spawn(async move {
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let mut interval = tokio::time::interval(Duration::from_secs(1));
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loop {
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interval.tick().await;
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let count = request_counter_clone.swap_and_sum();
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let rps = count as f64;
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let mut metrics_write = metrics_clone.write().await;
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let cpu_usage = metrics_write.refresh_cpu();
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metrics_write.add_requests_per_second(rps);
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metrics_write.add_cpu_usage(cpu_usage);
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}
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});
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// setup http server
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let make_svc = make_service_fn(move |_conn| {
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let request_counter = Arc::clone(&request_counter);
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let metrics = Arc::clone(&metrics);
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@ -203,6 +218,7 @@ async fn main() {
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}
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});
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// start server
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let addr = ([0, 0, 0, 0], 80).into();
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let server = Server::bind(&addr).serve(make_svc);
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println!("Server running on http://0.0.0.0:80");
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